My old boss worked on the Apollo mission comms, specifically the large dish antennas on the ship. It was just his way of joking about large numbers.
10 dB (deci-Bells) is an order of magnitude ratio; 10 dB = 10Log(10). For non ratios you tack on units, such as 30 dBHz = 10 Log(1 kHz). It just a way of expressing large values in engineering, and you can add the dB instead of multiplying in linear domain. You begin to think in dB after doing it for years.
The path losses stated in the replies are good examples when the rule is broken. The path loss is 22 dB + 20*Log(distance/wavelength). My universe/quark is just a joke of the most extreme ratio I can think of; I’m sure there are others larger.
10 dB (deci-Bells) is an order of magnitude ratio; 10 dB = 10Log(10). For non ratios you tack on units, such as 30 dBHz = 10 Log(1 kHz). It just a way of expressing large values in engineering, and you can add the dB instead of multiplying in linear domain. You begin to think in dB after doing it for years.
The path losses stated in the replies are good examples when the rule is broken. The path loss is 22 dB + 20*Log(distance/wavelength). My universe/quark is just a joke of the most extreme ratio I can think of; I’m sure there are others larger.
The national debt ought to be in dB$.